From 4894c8fcf7825270f6ee6f43a6fe73570c814695 Mon Sep 17 00:00:00 2001
From: Johnny Domino <johnny@brandingbrand.com>
Date: Sat, 23 Feb 2013 12:32:42 -0500
Subject: [PATCH] resolves #64 passing usage string to optimist

---
 lib/nconf/provider.js    | 14 +++++++++-----
 lib/nconf/stores/argv.js | 15 ++++++++++-----
 2 files changed, 19 insertions(+), 10 deletions(-)

diff --git a/lib/nconf/provider.js b/lib/nconf/provider.js
index 413df5f..e0aeb42 100644
--- a/lib/nconf/provider.js
+++ b/lib/nconf/provider.js
@@ -29,7 +29,11 @@ var Provider = exports.Provider = function (options) {
 // Define wrapper functions for using basic stores
 // in this instance
 //
-['argv', 'env'].forEach(function (type) {
+Provider.prototype['argv'] = function(options, usage) {
+  return this.add('argv', options, usage);
+};
+
+['env'].forEach(function (type) {
   Provider.prototype[type] = function (options) {
     return this.add(type, options);
   };
@@ -121,7 +125,7 @@ Provider.prototype.use = function (name, options) {
 //    provider.add('memory');
 //    provider.add('userconf', { type: 'file', filename: '/path/to/userconf' })
 //
-Provider.prototype.add = function (name, options) {
+Provider.prototype.add = function (name, options, usage) {
   options  = options      || {};
   var type = options.type || name;
 
@@ -129,7 +133,7 @@ Provider.prototype.add = function (name, options) {
     throw new Error('Cannot add store with unknown type: ' + type);
   }
 
-  this.stores[name] = this.create(type, options);
+  this.stores[name] = this.create(type, options, usage);
 
   if (this.stores[name].loadSync) {
     this.stores[name].loadSync();
@@ -157,8 +161,8 @@ Provider.prototype.remove = function (name) {
 // Creates a store of the specified `type` using the
 // specified `options`.
 //
-Provider.prototype.create = function (type, options) {
-  return new (require('../nconf')[common.capitalize(type.toLowerCase())])(options);
+Provider.prototype.create = function (type, options, usage) {
+  return new (require('../nconf')[common.capitalize(type.toLowerCase())])(options, usage);
 };
 
 //
diff --git a/lib/nconf/stores/argv.js b/lib/nconf/stores/argv.js
index 3841f7d..b130ce3 100644
--- a/lib/nconf/stores/argv.js
+++ b/lib/nconf/stores/argv.js
@@ -14,12 +14,13 @@ var util = require('util'),
 // Constructor function for the Argv nconf store, a simple abstraction
 // around the Memory store that can read command-line arguments.
 //
-var Argv = exports.Argv = function (options) {
+var Argv = exports.Argv = function (options, usage) {
   Memory.call(this, options);
 
   this.type     = 'argv';
   this.readOnly = true;
   this.options  = options || false;
+  this.usage    = usage;
 };
 
 // Inherit from the Memory store
@@ -41,11 +42,15 @@ Argv.prototype.loadSync = function () {
 //
 Argv.prototype.loadArgv = function () {
   var self = this,
-      argv;
+      optimist, argv;
 
-  argv = typeof this.options === 'object'
-    ? require('optimist')(process.argv.slice(2)).options(this.options).argv
-    : require('optimist')(process.argv.slice(2)).argv;
+  optimist = typeof this.options === 'object'
+    ? require('optimist')(process.argv.slice(2)).options(this.options)
+    : require('optimist')(process.argv.slice(2));
+
+  if (typeof this.usage === 'string') { optimist.usage(this.usage) }
+
+  argv = optimist.argv
 
   if (!argv) {
     return;